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Atrial Fibrillation Learning Center
Atrial fibrillation/flutter is a heart rhythm disorder (arrhythmia. It usually involves a rapid heart rate, in which the upper heart chambers (atria) are stimulated to contract in a very disorganized and abnormal manner.
Approximately 2.7 million people in the United States have atrial fibrillation. It is the most common type of heart arrhythmia (irregular...
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